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1Back to top Go down   Faulty speedo finally fixed! Empty Faulty speedo finally fixed! on Sat Jul 25, 2020 2:27 am

gabriel

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Faulty speedo finally fixed! Dba38710
Faulty speedo finally fixed! 15d99b10
Faulty speedo finally fixed! 25909010
Hi
My speedo shut down approximately eight years ago. Tachometer was fine.
Decided to try once again to open the gauge cluster. 
I looked at the long thin board (signal amplifier) and didn’t notice anything unusual. I decided to check the other side of the board and noticed there was a scorch mark and the copper tracks were a bit of a mess.
Turned the board over and noticed a very faint burn mark underneath a electrolytic capacitor the 10μf next to the green one.
I replaced the capacitor and applied deoxit to all the pins.
The speedometer and odometer now function correctly.
Anyone who has issues with their Speedo, I suggest a careful check of BOTH sides of the board.



Cheers

Gabriel


__________________________________________________
;BMW; 1984 BMW k100..frame number 6228?
    

2Back to top Go down   Faulty speedo finally fixed! Empty Re: Faulty speedo finally fixed! on Sat Jul 25, 2020 4:52 am

Dai

Dai
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Faulty speedo finally fixed! 212902


__________________________________________________
'83 K100 upgraded to K100RS spec, '87 K100RT
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California
    

3Back to top Go down   Faulty speedo finally fixed! Empty Re: Faulty speedo finally fixed! on Sat Jul 25, 2020 6:25 am

charlie99

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great solve 

good luck mate


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OFaulty speedo finally fixed! Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

4Back to top Go down   Faulty speedo finally fixed! Empty Re: Faulty speedo finally fixed! on Sat Jul 25, 2020 6:51 am

gabriel

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Thanks. 
The fixed location of the board at the bottom of the instrument gauge and the close proximity of the copper tracks makes me think moisture in the instrument gauge over the years corroded the tracks.
I’m very happy that it’s now working. The self cancelling indicators also work.
There was information from this forum and Motobrick which helped me to resolve this issue.
We are lucky to have access to this forum and the many members who volunteer information.
Next agenda item is my rear brake master cylinder......ouch....


__________________________________________________
;BMW; 1984 BMW k100..frame number 6228?
    

5Back to top Go down   Faulty speedo finally fixed! Empty Re: Faulty speedo finally fixed! on Sat Jul 25, 2020 7:28 am

Point-Seven-five

Point-Seven-five
Life time member
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Nice job repairing your speedometer! 

As far as the rear master cylinder, there are threads here and at Motobrick.com that describe replacing it with a ChiCom unit for under $20.  If you wear a mask and gloves while you handle it, you can get it on your bike without dying from the Covid-19 in a couple hours.


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

6Back to top Go down   Faulty speedo finally fixed! Empty Re: Faulty speedo finally fixed! on Sat Jul 25, 2020 7:33 am

charlie99

charlie99
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Faulty speedo finally fixed! 44271


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OFaulty speedo finally fixed! Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

7Back to top Go down   Faulty speedo finally fixed! Empty Re: Faulty speedo finally fixed! on Sun Jul 26, 2020 6:57 am

robmack

robmack
Life time member
Life time member
Good that you found the problem and were able to fix it.

More and more, these types of things are going to happen to our electronics. Capacitors have a useful life and the age of the electronics in our bike means that component failures, especially capacitors and transistors, will be on the rise. The most likely cause of your faulty speedo board was that the electrolytic cap shorted internally. That would cause the scorched PCB.


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

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